Book/Report

FZJ-2016-04796

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Tritium in Metallen: Präparationstechnik (Tritiumlabor): Eigenschaften von Tritium in Vanadium, Niob, Tantal und Palladium

Lässer, R.FZJ* ; Klatt, K.-H.FZJ* ; Mecking, P.FZJ* ; Wenzl, H.FZJ*

1982
Kernforschungsanlage Jülich GmbH, Zentralbiliothek, Verlag Jülich

Please use a persistent id in citations: http://hdl.handle.net/2128/12316

Report No.: Juel-1800

Abstract: In order to study the behaviour of tritium in metals, an all metal apparatus has been built for the safe handling of 100 mg of tritium (1000 Ci). This amount of tritium, for example, can load 10 g Pd to a concentration of T/Pd = 0.37. Samples can be loaded with tritium in a defined way by changing the gas pressure and the temperature. A PDP-II computer controlled the experiments by measuring pressures, room and sam pie temperatures and by adjusting the power for heating the sample. The main results of our studies in palladium, vanadium, niobium and tantalum are as follows: For the first time the phase diagram of the palladium-tritium system has been determined up to high concentrations. At constant concentration and temperature the following inequali ties hold for the desorption pressure: $P_{T_2}$(x, T) > $P_{D_2}$ (x, T) > $P_{H_2}$ (x, T). This is a consequence of the larger decrease of the energy of the vibrational levels in the molecule in comparison to the ones in the palladium lattice under isotopic exchange. In the two phase region ($\alpha$+$\beta$) the following values of the disintegration enthalpy $\Delta$H and -entropy $\Delta$S using the van't Hoff equation In p = - $\Delta$H/RT + $\Delta$S/R were obtained: [...]

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Contributing Institute(s):

1. Publikationen vor 2000 (PRE-2000 ; Retrocat)

Research Program(s):

1. 899 - ohne Topic (POF3-899) (POF3-899)

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